Sounds like you might have a short circuit in the left hand switch assembly. Take it apart and have a look for anything obvious, then check continuity of each affected circuit with a multimeter. Failing that, this sort thing can often be attributed to a bad earth, if a circuit can't get a good earth it will try and take the next easiest route to earth, usually through another circuit.

And welcome to XT660.com too!

You aren't an R&B singer by any chance?

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